diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2bed70b9..6683a86f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -16,6 +16,7 @@ This changelog also contains important changes in dependencies.
 
 ### Fixed
 - (svgtypes) Path parsing with `S` or `T` segments after `A`.
+- Bounding box calculation for the root group used for `viewBox` flattening.
 
 ## [0.43.0] - 2024-08-10
 ### Added
diff --git a/crates/usvg/src/parser/converter.rs b/crates/usvg/src/parser/converter.rs
index 55584db3..3b305f45 100644
--- a/crates/usvg/src/parser/converter.rs
+++ b/crates/usvg/src/parser/converter.rs
@@ -353,6 +353,7 @@ pub(crate) fn convert_doc(svg_doc: &svgtree::Document, opt: &Options) -> Result<
         g.transform = root_ts;
         g.abs_transform = root_ts;
         convert_children(svg_doc.root(), &state, &mut cache, &mut g);
+        g.calculate_bounding_boxes();
         tree.root.children.push(Node::Group(Box::new(g)));
     }